Effects of Magnetic Fields in Hot White Dwarfs
نویسندگان
چکیده
In this work, we study the effects of temperature on magnetic white dwarfs. We model their interior as a nuclei lattice surrounded by relativistic free Fermi gas electrons, accounting for from temperature, Landau levels and anomalous moment. find that, at low densities (corresponding to outer regions star), both field play an important role in calculation microscopic thermodynamical quantities. To macroscopic stellar structures within general-relativistic approach, solve numerically coupled Einstein's-Maxwell's equations fixed entropy per particle configurations discuss how affects profiles, masses radii.
منابع مشابه
Discovery of kilogauss magnetic fields in three DA white dwarfs
We have detected longitudinal magnetic fields between 2 and 4 kG in three (WD 0446−790, WD 1105−048, WD 2359−434) out of a sample of 12 normal DA white dwarfs by using optical spectropolarimetry done with the VLT Antu 8 m telescope equipped with FORS1. With the exception of 40 Eri B (4 kG) these are the first positive detections of magnetic fields in white dwarfs below 30 kG. Although suspected...
متن کاملKilo-gauss Magnetic Fields in three DA White Dwarfs
We have detected longitudinal magnetic fields between 2 and 4 kG in three normal DA white dwarfs (WD0446−790,WD1105−048,WD2359−434) out of a sample of 12 by using optical spectropolarimetry done with the VLT Antu 8 m telescope equipped with FORS1. With the exception of 40 Eri B (4 kG) these are the first positive detections of magnetic fields in white dwarfs below 30 kG. A detection rate of 25 ...
متن کاملCircumstellar features in hot DA white dwarfs
We present a phenomenological study of highly ionised, non-photospheric absorption features in high spectral resolution vacuum ultraviolet spectra of 23 hot DA white dwarfs. Prior to this study, four of the survey objects (Feige 24, REJ 0457-281, G191B2B and REJ 1614-085) were known to possess these features. We find four new objects with multiple components in one or more of the principal reso...
متن کاملMetal Abundances in Hot DA White Dwarfs
We compare measured element abundances in hot DA white dwarfs from UV observations to predictions from our self-consistent non-LTE model atmosphere diffusion calculations.
متن کاملPhotospheric metals in hot DA white dwarfs
Previous observations of the soft X-ray and EUV region with the Einstein, EXOSAT, and ROSAT satellites have indicated thepresenceof photospheric absorbers inmostDAwhite dwarfs with Teff >∼ 40000K. Several of these objects have now been observed with the Extreme Ultraviolet Explorer (EUVE). Since the detection of individual metal lines is rather difficult with EUVE spectra we chose the well stud...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2021
ISSN: ['2041-8213', '2041-8205']
DOI: https://doi.org/10.3847/1538-4357/ac1ba7